Battle of Köse Dağ
Battle of Köse Dağ
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Battle of Köse Dağ

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Battle of Köse Dağ

The Battle of Köse Dağ took place in eastern Anatolia on 26 June 1243 when an army of the Sultanate of Rum, led by Sultan Kaykhusraw II, confronted an invading Mongol army under the general Baiju and was decisively defeated. The battle was the pivotal event of the Mongol conquest of Anatolia: Rum, previously a significant independent power in the eastern Mediterranean, was reduced to the status of a client kingdom, and its territories were later absorbed into the Mongol Ilkhanate.

The Mongol Empire first achieved territorial contact with Rum in the early 1230s by conquering a large swathe of western Iran, but largely left it alone over the next decade. Instead, under their general Chormaqan, Mongol armies subjugated Transcaucasia and reduced the Kingdom of Georgia to a vassal state. Relations deteriorated after the accession of Kaykhusraw II to the Rum throne in 1237, and Mongol raids on Rum territory began in 1240. Two years later, Baiju, who had replaced Chormaqan after the latter became disabled, captured and pillaged the city of Erzurum, escalating hostilities into open war. He again invaded Rum in 1243, with an army of 30,000 Mongol troops accompanied by Georgian and Armenian auxiliaries.

Kaykhusraw built a large army to confront the invasion, but his 80,000-strong force lacked the discipline and cohesion of the Mongols. He ignored the cautious advice of experienced nobles under his command, and attacked his enemy on the pass of Köse Dağ Mountain on 26 June. For most of the day, the army of Rum appeared to be slightly superior, but it started to disintegrate late on. The apprehensive army of Rum fled during the night; Baiju missed the opportunity to capture the Sultan because he suspected the deserted enemy camp was a trap. Nevertheless, the Mongols captured several cities following their success at Köse Dağ, and exacted a vast annual tribute from their enemy. Rum never recovered from this critical defeat.

In 1071, the Seljuk Turks decisively defeated the Byzantine Empire at the Battle of Manzikert and quickly overran Anatolia. One Seljuk prince, Suleiman ibn Qutalmish, established an independent state in the region six years later. Known as the Sultanate of Rum, it conquered many groups, including the rebellious Turkoman nomads, and gained control of large parts of Anatolia over the next 150 years. By the 1230s, aided by the collapse of Byzantine power, Seljuk Rum had attained significant maritime and commercial capabilities through their control of the key ports of Antalya and Sinope.

The Mongol Empire was established in 1206 by Genghis Khan (r. 1206–1227). During his reign, the Mongols dismantled the Jin dynasty and the Western Xia state in northern China, the Qara Khitai in Turkestan, and the Khwarazmian Empire in Central Asia and Persia. Under Genghis's son and successor Ögedei Khan (r. 1229–1241), further military campaigns were launched against the remnants of the Jin, while another force invaded first the Russian principalities and then central Europe between 1236 and 1242.

A further army, commanded by the general Chormaqan, was dispatched in 1230 to eliminate the renegade Khwarazmian prince Jalal al-Din who had founded a state in western Iran. This mission was soon accomplished, with Jalal al-Din killed by a Kurd in August 1231. Chormaqan set up his headquarters on the fertile Mughan plain, and for the next decade consolidated Mongol rule over western Iran and Transcaucasia. With 30,000 men under his command, he marched every year against hostile fortresses in the Caucasus region, focusing especially on subduing the Kingdom of Georgia; by 1239 the Mongols had conquered much of its land and forced the remainder, ruled by Queen Rusudan, to become a vassal state. In c. 1240, Chormaqan was incapacitated by either deafness, a form of paralysis, or possibly both. He was replaced by Baiju, his second in command.

Kayqubad I, the sultan of Rum between 1220 and 1237, had correctly feared that Jalal al-Din's activities would draw the attention of the Mongols to the lands surrounding his realm. Although Rum was known for its excellent pastures, the Mongols did not initially attack it, aside from a raid in 1232 led by Baiju on the lands around Sivas. They instead accepted the Seljuk offerings of friendship and a small tribute; Kayqubad also accepted the Mongols' request that he personally travel to the Mongol ruler in Karakorum to pay homage, but died before he did so. Relations deteriorated during the reign of Kayqubad's successor Kaykhusraw II (r. 1237–1246). Even though he submitted at first, Kaykhusraw may have felt that the Mongols did not want to attack or that he could repel them. By 1240, relations had degraded so badly that the Mongols began to raid Seljuk territory; that year, Rum was likely weakened by the Babai revolt led by Baba Ishak, a local preacher. Nevertheless, Kaykhusraw acted aggressively, campaigning against the city of Amid, close to Mongol territory, in 1240–41.

In 1242, Baiju escalated hostilities into open war. His Mongol army, accompanied by Christian Caucasian auxiliaries, demanded the submission of the city of Erzurum, which had been under Seljuk rule since 1071; when the Mongol ambassadors were insultingly rejected, the city was besieged. After two months, the Mongols' siege engines breached the walls, whereupon the city was sacked—unusually for the Mongols, even churches were pillaged for their treasures, which Baiju's Christian troops distributed among their own settlements. Baiju then retreated to spend the winter on the Mughan plain, before marching into Rum again the following year.

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